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Solar activity report
Report of Solar-Geophysical Activity 2026 Mar 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 79 Issued at 2200Z on 20 Mar 2026IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 2 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low with a
slight chance for an M-class flare on days one, two, and three (21 Mar,
22 Mar, 23 Mar).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at quiet to major storm levels for the past 24 hours.
Solar wind speed reached a peak of 567 km/s at 20/2021Z. Total IMF
reached 36 nT at 20/2100Z. The maximum southward component of Bz reached
-22 nT at 20/2042Z. Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 2623 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to severe storm levels on day one (21 Mar), unsettled
to minor storm levels on day two (22 Mar) and quiet to active levels on
day three (23 Mar).
III. Event Probabilities 21 Mar to 23 Mar
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Mar 102 Predicted 21 Mar-23 Mar 102/100/100 90 Day Mean 20 Mar 141
V. Geomagnetic A Indices
Observed Afr/Ap 19 Mar 003/003 Estimated Afr/Ap 20 Mar 020/034 Predicted Afr/Ap 21 Mar-23 Mar 032/055-020/030-015/016
VI. Geomagnetic Activity Probabilities 21 Mar to 23 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 45% | 40% |
| Minor storm | 35% | 30% | 15% |
| Major-severe storm | 50% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 10% |
| Minor storm | 10% | 20% | 25% |
| Major-severe storm | 85% | 70% | 55% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/02/04 | X4.21 |
| Last M-flare | 2026/03/26 | M4.0 |
| Last geomagnetic storm | 2026/03/25 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (4%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2026 | 78.2 -34.3 |
| March 2026 | 80.2 +2 |
| Last 30 days | 77.8 -4.5 |